Improvement in machines for making sheet-metal traps or bends



'w. A. BUTLER. V

MACHINE FOR MAKING SHEET METAL TRAP-S 0R IBENDS. No. 170,051. PatentedNov.16,18'75".

UNITED/STATES WILLIAM A. BUTLER, oF-N'Ew roams. Y.

.IMPROVE MENT IN MACHINES FOR MAKINGSHEET-METAL TRAPS QR BENDS.

Specification forming part of Letters Paient No. 70,051, dated November16, 1875; application filed l July 24, 1875. i

To all whom it may concern:

Be it known thatv I, WILLIAM A. BUTLER, of the city, county, and Stateof New York, have invented a new and .useful'Improvement in Presses, forMaking SheetMetal Traps or Bends; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing, which forms part of thisspecification.

This invention relates to presses for making sheet-metal water-traps orbends in longitudinal halves, or similar sections, which are afterwardunited by soldering or burning, as described in Letters Patent forimprovement in water-traps issued to me July 6, 1875, irrespective,however, of any particular direction for the seam, but the press willhere be represented as constructed to form the seam so that it will runalong the front or back, and in a plane running through the center ofthe trap or bend, and intersecting its curvature. The press may,however,be constructed to produce half-traps, or sections,with the seam or seamsdifferently arranged, and the invention is not restricted to any form oftrap or bend.

The invention consists in a novel construction of the dies for stampingout each longitudinal section of the trap or bend from the sheet metalintroduced between the dies, whereby each of said longitudinal sectionsis formed by the stamping process, which gives to the trap or bend itsrequired form, with a flange along its opposite edges, so that, onbringing the flanges thus produced of two matching trap or bend sectionstogether, they may be readily united by burning by the aid of ablow-pipe, and the trap or bend is materially strengthened at its seamor seams.

Figure 1 represents an elevation of a droppress, having dies forstamping the one longitudinal half-section of an S-shaped Water-trap inaccordance with my invention; Fig. 2, a face view of the bottom die usedin making such half-trap sections; Fig. 3, a longitudinal view from thehollow or inner side of said trap-section after it is removed from thebottom die; and Fig. 4, a transverse section thereof. Fig. 5 is a viewfrom the hollow inner side a will be pressed by the upper die intothelower one, and by the longitudinal and transverse contours of theformers b and c the required general configuration be given to thehalf-trap C. To stamp out,-however, such half-trap from the sheet ofmetal introduced between the dies, and to form or provide eachtrapsection with a flange, 01, along its edges, for

uniting, as hereinbefore described, the two matching trap-sectionstogether, the female former c of the die B is made with marginal ledges0 throughout its length on both or opposite sides, and the male die Aformed with corresponding recesses f, for the reception of said ledgeswith the metal being stamped in between them, and said male die furtherformed with cutters or cutting-projections g, extending down from theoutside edges of therecesses f, on opposite sides of the former 11,throughout the length of the latter. These cutters g are arranged sothat when the die A is brought down or dropped they will pass in ashearing manner the outside edges of the ribs or ledges 0, thus not onlystamping out the half-trap to its required shape, but leaving it withflanges 01 along its two edges, said flanges corresponding with theupper faces of the ledges e. After two matching trap-sections have beenthus produced. and formed with edge flanges, as described, the same areplaced with their flanges face to face, and the meeting flanges burnedby the aid of a blowpipe to unite the sections.

The same method of construction, as regards the dies, applies to theproduction of sheetmetal elbows or bends in two longitudinal halves orsections. Thus, Fig. 5 shows a longitudinal half-section of a bend, D,having longitudinal edge flanges d, which may be prodnced in like manneras the half-trap, and be united at its flanges, ashereinbefore'described, with the flanges of a corresponding ormatchinghalf-bend to make the entire bend. A water-trap might be constructed of.a series of such bends soldered'together at their transverse junctions.It is preferred, however, to make it of two half-sections only, asdescribed with reference to Figs. 1, 2, 3, and 4 of the drawing, andwhen the trap is designed to be provided with a tap-screw, then a hole,8, for

the purpose, may be formed in its one half-section by striking on aspring-punch, E, which is carried by the die A, and faces aclearanceaperture, 6, in the lower die. This is done after the metal hasbeen stamped out to form the half-trap before the removal of the latterfrom the lower die and while the top die is down.

I claim--- v The female die B, having ledges 6 along either edge of itsforming chamber or cavity, in combination with the male die A, havingcutters g correspondingly arranged on its face in relation with theformer thereon, for operation in relation with each other, substantiallyas and for the purposes herein set forth.

WM. A. BUTLER.

Witnesses:

VERNON H. HARRIS, FRED. HAYNES.

